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The effect of age on AV nodal properties allowing induction of AV nodal reentrant tachycardia Koji Kubota 1 , Takayuki Ikeda 1 , Naoki Sugimoto 1 , Satoshi Nakamura 1 , Daiju Morishita 1 , Toshisuke Terakawa 1 , Ryukichi Hirose 1 , Nobu Hattori 1 1The First Department of Internal Medicine, School of Medicine, Kanazawa University pp.1195-1200
Published Date 1986/11/15
DOI https://doi.org/10.11477/mf.1404204959
  • Abstract
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We examined 47 patients with dual atrioventricular (AV) nodal pathways in order to delineate the effect of age on AV nodal properties allowing of AV nodal reentry.

In 16 out of 47 patients, spontaneous paroxysmal supraventricular tachycardia was documented clinically and AV nodal reentrant tachycardia could be demon-strated during electrophysiological studies. AV nodal conduction time (AH), refractory periods of the AV node (AVN-ERP and AVN-FRP) and the shortest paced cycle length with 1 : 1 AV nodal conduction (AVCL 1:1) in the patients with and without AV nodal reentrant tachycardia were, respectively : AH 80.0±15.1 (mean±SD) and 99.5±33.5 msec (p< 0.05), AVN-ERP 258.3±24.1 and 338.3±171.0 msec (p<0.001), AVN-FRP 400.6±37.0 and 481.1±96.0 msec (p<0.01) and AVCL 1 : 1 364.4±41.9 and 484.2±125.2 msec (p<0.001).

AV nodal reentrant tachycardia was commoner in the patients with dual AV nodal pathways between the age of 40 and 59 years (group B ; S out of 1S) than in patients before age 40 years (group A ; 2 out of 11) and than in patients after age 60 years (group C ; 6 out of 1S) . AH, AVN-ERP, AVN-FRP and AVCL 1 : 1 in the group A, B and C were, respectively AH 96.4±49.7, 86.4±22.7 and 97.2±19.3 msec, AVN-ERP 330.0±113.0, 290.6±46.4 and 331.3± 56.0 msec (p<0.05 : B vs C), AVN-FRP 480.5± 117.3, 412.5±43.8 and 478.3±192.7 msec (p<0. 05 : A vs B, p<0.02 : B vs C) and AVCL 1 : 1 480.0± 166.2, 387.2±50.4 and 477.2±118.0 msec (p< 0.02 : A vs B, p<0.01 : B vs C).

Regardless of whether AV nodal dysfunction observed in the group A and C may be due to functional or anatomic disintegration of the node, induction of AV nodal reentrant tachycardia is considered to be associated with AV nodal properties for enhanced conduction.


Copyright © 1986, Igaku-Shoin Ltd. All rights reserved.

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電子版ISSN 1882-1200 印刷版ISSN 0452-3458 医学書院

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